Strength of spot welding, Mechanical Engineering

Strength of spot welding

Because spot welding has generally replaced riveting in many applications, it is reasonable to compare these two processes for strength. Often, riveted joints are designed on the basis d = 1.2 t, where 'd' is the rivet diameter and 't' is the sheet thickness. In a riveted joint, the holes for the plate weakens the plate. With a spot welded joint, the weld is integral with the plate so that the only weakening occurring is that due to the softening effect of the welding heat. Higher efficiencies can therefore be achieved in welding. Since, weld diameter is so closely related to electrode tip diameter, the later maybe quoted for spot welding and the electrode diameter d is made equal to t. d2 = (0.1 + 2t) is another empirical formula used in the case of plates which are not very thick or thin. It is important to recognise when considering the strength of a spot weld that in a sheet metal the weld is rarely, if ever, stressed solely in shear because of distortion which take place around the weld under load. Under these conditions, the ductility of the parent metal at the periphery of the metal can have a dominating influence. A useful indication of weld ductility is obtained by taking the ratio of cross-section strength (ft) and shear strength(fs). This ductility ratio ft/fs approaches 1 for maximum ductility and approaches '0' where extreme brittleness is present.

Posted Date: 9/17/2012 2:54:51 AM | Location : United States







Related Discussions:- Strength of spot welding, Assignment Help, Ask Question on Strength of spot welding, Get Answer, Expert's Help, Strength of spot welding Discussions

Write discussion on Strength of spot welding
Your posts are moderated
Related Questions
If Taylor's tool life constants for a provided operation are specified of n = 0.5 and c = 400, what is the percentage increase in tool life when the cutting speed is reduced by hal

A helical compression spring prepared of oil tempered carbon steel, is subjected to a load which goes from 600 N to 1600 N. The spring index is 6 and the design factor of safety is

Consideration: 1. From above equation, it is clear that centrifugal tension is not dependent of T1 and T2. It depends upon velocity of the belt. For lower belt speed (that is,

A body is subjected to two harmonic motions as given below : X 1 = 15 sin (wt + 30 0 ) and X 2 = 8 cos (wt + 60 0 ). What harmonic motion should be given to the body to bring

Determine the critical load (W crit ) to cause elastic instability of the rigidly jointed frame shown in Figure Q2. The frame members have constant bending stif

what is the health effects of ultraviolet ray on the eyes of welders

Describe the key terms i. Write two differences between turbine and boiler. ii. Write importance of mollier's diagram iii. Compare the rankine cycle with carnot cycle in k

(a) Derive the mathematical expression for Steady Flow Energy Equation. State the assumption made before the derivation. (b) The internal energy of a substance is provided by th

a) Can you explain Discuss LVDI in detail. b) Derive the expression for calculating strain using wheatstone bridge. c) Distinguish between analog and digital transducers.

with the aid of notes and sketches describe how you would transfer the design from a sheet of paper onto the wooden panel prior to carving